Need help geometry
Fill in the blank. Use ∆ABC to answer the following:

6 inches

Step-by-step explanation:

∆ABD and ∆ACD are exactly the same, only back-to-back

So the base of both triangles are 3 inches

3 + 3 = 6

Thus, the length of line BC is 6 inches

m∠1 = 90°

/_ CAD = 45°

isaiah walks 3 miles due north, turns and then 5 miles due east. how far is he from his starting point?

a^2 + b^2 = c^2

let c = distance from starting point.

(3)^2 + (5)^2 = c^2

9 + 25 = c^2

34 = c^2

sqrt{34} = sqrt{c^2}

sqrt{34} = c